Abstract
The purpose of this research is to investigate the feasibility of evaluating the human’s balancing ability by means of the human body’s swaying acceleration measurements instead of the traditional center-of-pressure (COP) measurement. The COP measurement has been used broadly for assessing the balance ability of patients in hospitals. However, the force plate system which is employed to measure the COP signals of the human body is generally restrictive due to the very high cost as well as the bulky portability. In this study, the balancing ability of the human body was evaluated through the measurements of a capacitive accelerometer. The segmentalized principal components analysis (sPCA) was employed to reduce the influence of the gravity component in acceleration measurement projected onto the horizontal components while the accelerometer inevitably tilts. The signal relationship between the COP and the acceleration was derived, so that the swaying acceleration measurements of human body can be utilized to evaluate the human body’s balancing ability.
Highlights
The aging trend of the social population has been a problem in all the developed countries, and healthcare for the elderly has become an essential issue
The capacitive accelerometer (CXL04GP3-R-AL, MEMSIC Inc.) was bound on the waist of the examinee to measure the acceleration of human body swaying in the three directions
The acceleration signals were recorded by the data acquisition device (NI 9234) with the same sampling rate as the COP signals
Summary
The aging trend of the social population has been a problem in all the developed countries, and healthcare for the elderly has become an essential issue. The capacitive accelerometer inherently contains the gravity component on the vertical axis and the gravitation may be projected onto the measurements on the three axes with a time-varying manner, while the bind-in accelerometer tilts along with the human body’s swaying It is definitely an obstacle and there is difficulty deriving the correlation between the COP signal and acceleration measurement. LTD.) and a signal acquisition device (eStrain 4B4V, Chief SI Company) In this experiment, the COP signals were recorded with the sampling rate of 100 Hz. Simultaneously, the capacitive accelerometer (CXL04GP3-R-AL, MEMSIC Inc.) was bound on the waist of the examinee (around the mass center of the human body) to measure the acceleration of human body swaying in the three directions. The force plate of that examinee on was used to measure the COP locus of the examinee
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